... ABSTRACT Deep shale gas with a burial depth of 3500–5000m became an important area for shale gas development in China. The characteristics of the rock's mechanics and the in situ stress have a significant impact on the drilling and fracturing effects of horizontal wells. Finite element...

... & Gas cap rock pressure loss Reservoir Characterization overburden injection pressure operation hydraulic fracturing fracture propagation pressure pressure decline breakdown pressure pi fb test injector well test result situ stress carbonate 1. INTRODUCTION Petrobras pre-salt carbonate...

...1. INTRODUCTION The understanding of in situ stresses is very important in the oil and gas exploitation including wide engineering fields such as drilling, stimulation by fracturing, sand control, etc. There are many methods that can be used in laboratory and oil/gas field for obtaining some...

... the drilling operation process, wellbore stability is one of the most important issues. Wellbore failure causes economic losses of hundreds of millions of dollars every year. Before a drilling operation, deep underground rock is in a state of equilibrium between the loading of original in situ stress and pore...

... ABSTRACT: The in situ stress regime is one of the most important inputs for any subsurface project in civil, mining and petroleum engineering, and combined with soil and/or rock strength generates a geomechanical model, which can be used to predict the ultimate loading that geological...

... and rock mass failure criteria which can be fed back into the static stress model to improve it. In this paper we apply these techniques at Barrick Williams Mine in Canada to an area of the mine where the assumed in situ stress conditions did not match underground observations (damage of boreholes...

... evaluated based on two constitutive models built in FLAC. The simulation shows that the long-term contact pressure will increase from the preset wellbore pressure and eventually reach the in situ stress state, regardless of the mechanical property of the rock and the relative size of the casing annulus...

... reservoir climate change Upstream Oil & Gas thermal stress overpressure Geothermal System gradient stimulation coefficient hydraulic fracture fracture injection well geothermal field injection permeability fracture network situ stress stress field rock matrix 1. INTRODUCTION...

... charge to overcome the in situ stresses and create fractures in various directions, in contrast to one preferentially aligned fracture formed during hydraulic fracturing. However, it is also well known that shock waves emanating from a detonation can compact the rock and reduce the permeability (Reeves...

.... This paper presents a Discrete Fracture Network (DFN) approach to deep fluid injection into fractured rock. The approach presented combines continuum and discontinuum geomechanics, considering the effect of discrete fracture shear and normal deformation on rock modulus and in situ stress. Stress and pressure...

... Abstract The aim of this study is to present an analytical probabilistic approach using Monte Carlo Simulation method to estimate the minimum horizontal in situ stress magnitude from a single Leak-off test (LOT) acquired in highly deviated well in a sand interval inside the reservoir section...

...1. INTRODUCTION Evaluation of in situ stresses is of paramount importance in the oil & gas industry as it impacts various operations such as safe drilling, hydraulic fracturing, and fault reactivation. Because it is not possible to directly measure stresses, they are back analyzed. The most popular...

... model input parameters were varied by predetermined amounts: 1) rockbolt grout strength, 2) rock mass deformation modulus, 3) joint friction angle, 4) joint stiffness, and 5) in situ stress. Based on the results obtained from the sensitivity analysis, high in situ stresses, low joint friction angle...

...1. INTRODUCTION In situ stress tensor is one of the major parameters required to analyze a wide variety of geomechanics problems, which include CO2 injection in greenhouse gas sequestration [1, 2], hydraulic stimulation for geothermal energy [3] and shale gas development [4]. While the first order...

... at ARMA 13-110 Scanning Electron Microscopy (SEM) and Profilometer Scanning Microscopy to Estimate In Situ Stresses in a Dolomite Core Specimen Mahbaz, S.B., Goddard, A., and Dusseault, M.B. University of Waterloo, Waterloo, Ontario, Canada Copyright 2013 ARMA, American Rock Mechanics Association...

... fractures are open in specific orientations to conduct reservoir fluids. Furthermore, the magnitude and direction of horizontal stresses play critical roles in hydraulic fracture design, as hydraulic fracturing is the primary stimulation method for NFCR s. In situ stress field can be determined through...

... ABSTRACT: Borehole breakouts were commonly observed in the boreholes drilled in unconsolidated deepwater sediments near the Nankai Trough, SW Japan. The use of borehole breakouts enabled us to constrain in situ stress states. While it was straightforward to estimate the stress direction based...

... ABSTRACT: Redistribution of in situ stresses so they exceed rock strength leads to yielding of the intact rock material around a tunnel after excavation, causing large plastic deformations often referred to as ground squeezing. This tunneling problem typically occurs during deep tunneling...

...1. INTRODUCTION The knowledge of in situ stresses is a key parameter in the design of underground openings to insure their stability. There are many techniques available to accurately determine the initial stress regime in place [1]. Most of these techniques are based on strain recovery when...

... horizontal stresses are not always undesirable, experience shows that severe strata control problem may be encountered in the presence of very high horizontal in situ stresses, especially if the difference between the maximum and minimum horizontal in situ stresses is high. In such situation the orientation...